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Showing 1–4 of 4 results
Advanced filters: Author: Michael K. Watkeys Clear advanced filters

  • The rapid decay of Earth’s dipole magnetic field has recently captured the public imagination. Here, the authors present a southern hemisphere magnetic record from South African Iron Age sites using oriented samples in the floors and suggest that the anomalous field behaviour is not just a recent feature.

    • John A. Tarduno
    • Michael K. Watkeys
    • Courtney L. Wagner
    ResearchOpen Access
    Nature Communications
    Volume: 6, P: 1-6

  • Analysis of silicate rocks from the Archaean Kaapvaal craton is used to obtain palaeodirections and intensities of the Earth's magnetic field some 3.2 billion years ago, and finds that the field strength was within 50 per cent of the present-day value, indicating that a viable magnetosphere sheltered the early Earth's atmosphere from solar wind erosion.

    • John A. Tarduno
    • Rory D. Cottrell
    • Dorothy Bauch
    Research
    Nature
    Volume: 446, P: 657-660

  • Magnetic palaeointensity data from the Barberton Greenstone Belt (South Africa) as well as the Jack Hills (Western Australia) show nearly constant palaeofield values between 3.9 Ga and 3.4 Ga, providing evidence for stagnant-lid mantle convection.

    • John A. Tarduno
    • Rory D. Cottrell
    • Gautam Mitra
    ResearchOpen Access
    Nature
    Volume: 618, P: 531-536

  • An ultra-weak magnetic field from Earth’s core lasting for at least 26 million years may have contributed to Earth’s oxygenation and further diversification of the Ediacaran fauna, according to single-crystal paleointensity data from igneous rocks in South Africa and Brazil.

    • Wentao Huang
    • John A. Tarduno
    • Michael K. Watkeys
    ResearchOpen Access
    Communications Earth & Environment
    Volume: 5, P: 1-8